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    Lec 42 - First living things on land clarification

    First living things on land clarification First living things on land clarification (This video copyrighted under Create Commons Attribution and Share-Alike CC-BY-SA license)

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    Lec 43 - Plate Tectonics-- Difference between crust and lithosphere

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    Lec 1 - Scale of Earth and Sun

    Lec 2 - Scale of Solar System

    Lec 3 - Scale of Distance to Closest Stars

    Lec 4 - Scale of the Galaxy

    Lec 5 - Intergalactic Scale

    Lec 6 - Hubble Image of Galaxies

    Lec 7 - Big Bang Introduction

    Lec 8 - Radius of Observable Universe

    Lec 9 - (Correction) Radius of Observable Universe

    Lec 10 - Red Shift

    Lec 11 - Cosmic Background Radiation

    Lec 12 - Cosmic Background Radiation 2

    Lec 13 - Cosmological Time Scale 1

    Lec 14 - Cosmological Time Scale 2

    Lec 15 - Four Fundamental Forces

    Lec 16 - Birth of Stars

    Lec 17 - Becoming a Red Giant

    Lec 18 - White and Black Dwarfs

    Lec 19 - A Universe Smaller than the Observable

    Lec 20 - Star Field and Nebula Images

    Lec 21 - Parallax in Observing Stars

    Lec 22 - Stellar Parallax

    Lec 23 - Stellar Distance Using Parallax

    Lec 24 - Stellar Parallax Clarification

    Lec 25 - Parsec Definition

    Lec 26 - Hubble's Law

    Lec 27 - Lifecycle of Massive Stars

    Lec 28 - Supernova (Supernovae)

    Lec 29 - Supernova clarification

    Lec 30 - Black Holes

    Lec 31 - Cepheid Variables 1

    Lec 32 - Why Cepheids Pulsate

    Lec 33 - Why Gravity Gets So Strong Near Dense Objects

    Lec 34 - Supermassive Black Holes

    Lec 35 - Quasars

    Lec 36 - Quasar Correction

    Lec 37 - Galactic Collisions

    Lec 38 - Earth Formation

    Lec 39 - Beginnings of Life

    Lec 40 - Ozone Layer and Eukaryotes Show Up in the Proterozoic Eon

    Lec 41 - Biodiversity Flourishes in Phanerozoic Eon

    Lec 43 - Plate Tectonics-- Difference between crust and lithosphere

    Lec 44 - Structure of the Earth

    Lec 45 - Plate Tectonics -- Evidence of plate movement

    Lec 46 - Plate Tectonics -- Geological Features of Divergent Plate Boundaries

    Lec 47 - cPlate Tectonics-- Geological features of Convergent Plate Boundaries

    Lec 48 - Plates Moving Due to Convection in Mantle

    Lec 49 v- Hawaiian Islands Formation

    Lec 50 - Compositional and Mechanical Layers of the Earth

    Lec 51 - Seismic Waves

    Lec 52 - Why S-Waves Only Travel in Solids

    Lec 53 - Refraction of Seismic Waves

    Lec 54 - The Mohorovicic Seismic Discontinuity

    Lec 55 - How we know about the Earth's core

    Lec 56 - Pangaea

    Lec 57 - Scale of the Large

    Lec 58 - cScale of the Small

    Lec 59 - Detectable Civilizations in our Galaxy 1

    Lec 60 - Detectable Civilizations in our Galaxy 2

    Lec 61 - Detectable Civilizations in our Galaxy 3

    Lec 62 - Detectable Civilizations in our Galaxy 4

    Lec 63 - Detectable Civilizations in our Galaxy 5

    Lec 64 - Human Evolution Overview

    Lec 65 - Understanding Calendar Notation

    Lec 66 - Correction Calendar Notation

    Lec 67 - Development of Agriculture and Writing

    Lec 68 - Introduction to Light

    Lec 69 - Seasons Aren't Dictated by Closeness to Sun

    Lec 70 - How Earth's Tilt Causes Seasons

    Lec 71 - Milankovitch Cycles Precession and Obliquity

    Lec 72 - Are Southern Hemisphere Seasons More Severe?

    Lec 73 - Precession Causing Perihelion to Happen Later

    Lec 74 - What Causes Precession and Other Orbital Changes

    Lec 75 - Apsidal Precession (Perihelion Precession) and Milankovitch Cycles

    Lec 76 - Firestick Farming

    Lec 77 - Carbon 14 Dating 1

    Lec 78 - Carbon 14 Dating 2

    Lec 79 - Potassium-Argon (K-Ar) Dating

    Lec 80 - K-Ar Dating Calculation

    Lec 81 - Chronometric Revolution

    Lec 82 - Collective Learning

    Lec 83 - Land Productivity Limiting Human Population

    Lec 84 - Energy Inputs for Tilling a Hectare of Land

    Lec 85 - Random Predictions for 2060